Referenced in: none

Automatically associated channels: Slo1

Title: Loose coupling between Ca2+ channels and release sensors at a plastic hippocampal synapse.

Authors: Nicholas P Vyleta, Peter Jonas

Journal, date & volume: Science, 2014 Feb 7 , 343, 665-70

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/24503854

Abstract
The distance between Ca(2+) channels and release sensors determines the speed and efficacy of synaptic transmission. Tight "nanodomain" channel-sensor coupling initiates transmitter release at synapses in the mature brain, whereas loose "microdomain" coupling appears restricted to early developmental stages. To probe the coupling configuration at a plastic synapse in the mature central nervous system, we performed paired recordings between mossy fiber terminals and CA3 pyramidal neurons in rat hippocampus. Millimolar concentrations of both the fast Ca(2+) chelator BAPTA [1,2-bis(2-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid] and the slow chelator EGTA efficiently suppressed transmitter release, indicating loose coupling between Ca(2+) channels and release sensors. Loose coupling enabled the control of initial release probability by fast endogenous Ca(2+) buffers and the generation of facilitation by buffer saturation. Thus, loose coupling provides the molecular framework for presynaptic plasticity.